Miniaturized monopole and dipole antenna designs are reported with performances optimized for Ultra Wideband pulsed radio applications. The geometries are created using Bézier spline shapes, which have been refined with a genetic algorithm to simultaneously take account of both frequency- and time-domain criteria. Time-domain measurements of ultra wideband antennas that exhibit uniformly distributed energy across the full 3.1 - 10.6 GHz mask are reported for the first time and validate a new approach to minimization of pulse dispersion effects in the antenna designs.